I have a 3 year old and a 9 month old. I have a 5 door and it has been perfect for me.
I always thought that a 3 door would be manageable, but now with experience a 5 door is the way ahead.
Accessing the kids seats in the back from a 3 door will be very hard to do especially once the kid becomes heavier, i mean 9 months onwards, especially for the wife
trust me go for practicability not looks etc